A high temperature resistant, heat insulating and chemical medium resistant coating for armed escort vehicles

Abstract

The present invention discloses a high temperature resistant, heat insulating and chemical medium resistant coating for an armed escort vehicle, which is composed of a heat resistant and anticorrosive base coating and a high temperature resistant, heat insulating and chemical resistant top coating, characterized in that the heat resistant and anticorrosive base coating includes graphene oxide and waterborne polyurethane; the high temperature resistant, heat insulating and chemical resistant top coating includes a mixture of surface modified silicon oxide hollow microspheres and a hybrid resin, which is applied on the heat resistant and anticorrosive base coating, and is baked using a programmed temperature rise, and the final temperature reaches 180°C-200°C and is maintained for 1 hour. The present invention has been tested and found that the coating can be heat-insulated, resistant to 1000°C high temperature, has extraordinary anticorrosion performance, can withstand neutral salt spray for up to 3000h, and has long-lasting weather resistance, and can withstand artificial aging for up to 2000h.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a high temperature resistant, heat insulating and chemical medium resistant coating for an armed escort vehicle. Background Art

[0002] Armed escort is an important component of my country's security enterprises and an effective measure to maintain national and regional financial security. The demand for armed escort vehicles is increasing, and the demand for special coatings is also increasing. Due to the high standards of special coatings for armed escort vehicles, existing coatings cannot meet the requirements of high corrosion resistance, heat insulation, high temperature resistance, and chemical resistance.

[0003] With the development of economic globalization and the booming logistics industry, transportation safety has become an issue that all countries and regions need to pay great attention to. In terms of ensuring transportation safety, armed escort vehicles have been widely used as a means of security. However, large-scale transportation in harsh environments can easily cause damage to vehicles, leading to a continuous increase in vehicle maintenance costs. Therefore, it is very necessary to develop a special coating with stronger durability and more special functions.

[0004] The research and development of special coatings involves multiple fields, such as materials science, chemical engineering, and application technology. First, it is necessary to select suitable materials as the basis of the coating, and then achieve special functions through chemical reactions. For example, adding preservatives can improve the anti-corrosion performance of the coating; adding thermal insulation materials can improve the thermal insulation performance of the coating; adding antioxidants can improve the high temperature resistance of the coating; adding anti-corrosion agents can improve the coating's tolerance to chemical media, etc.

[0005] In the process of developing special coatings, it is necessary to fully consider the special requirements of the use environment and market demand. On the one hand, the coating needs to meet the protection requirements for the vehicle and needs to be able to continue to work under extremely harsh climatic conditions; on the other hand, the performance of the coating needs to meet market demand and environmental protection requirements, such as complying with national environmental protection requirements and not polluting the environment.

[0006] In view of the high standards required for special coatings for armed escort vehicles, the coating technology currently on the market still has certain limitations. Although existing coatings can provide a certain degree of anti-corrosion effect, they cannot simultaneously have excellent heat insulation, high temperature resistance and chemical resistance. In extreme cases, these problems may cause the escort vehicle to be unable to continue its mission due to damage, thereby increasing the risk and cost of transporting goods. Summary of the invention

[0007] The purpose of the present invention is to provide a high temperature resistant, heat insulating and chemical medium resistant coating for an armed escort vehicle, which solves the shortcomings of the prior art.

[0008] The present invention adopts the following technical scheme: a high-temperature resistant, heat-insulating, and chemical-resistant medium coating for an armed escort vehicle, which is composed of a heat-resistant and anti-corrosion base coating and a high-temperature resistant, heat-insulating, and chemical-resistant top coating. The heat-resistant and anti-corrosion base coating includes graphene oxide and water-based polyurethane; the high-temperature resistant, heat-insulating, and chemical-resistant top coating includes a mixture of surface-modified silica hollow microspheres and a hybrid resin.

[0009] Furthermore, the preparation method of the heat-resistant and anti-corrosion primer comprises the following steps:

[0010] Step S1: 30 ml of xylene, 20 ml of N,N-dimethylformamide and 10 ml of N-methylpyrrolidone were added to obtain a mixed solution;

[0011] Step S2: Then add graphene oxide powder at 0.5 g / ml and shear at high speed for 0.5 h;

[0012] Step S3: Add 10 ml of the obtained modified graphene oxide dispersion to 10 m of aqueous polyurethane emulsion to prepare a modified graphene oxide aqueous polyurethane anti-corrosion coating.

[0013] Further, the preparation method of the surface modified silica hollow microspheres comprises the following steps:

[0014] 30 g of perfluoroalkoxysilane and 10 g of hollow silica microbeads were mixed evenly in 100 mL of isopropanol, heated under reflux for 5 h at 50 °C, the coupling agent was controlled to hydrolyze gradually, and the dissociated Si-OH was dehydrated and cross-linked with the Si-OH groups on the surface of the microbeads; the mixture was washed three times with 500 mL of anhydrous ethanol, filtered, and vacuum dried to obtain surface-modified hollow silica microbeads.

[0015] Furthermore, the preparation method of the high temperature resistant-heat insulating-chemical resistant top coating comprises the following steps:

[0016] Step S11: 30 g of perfluoroalkoxysilane and 10 g of hollow silica microbead powder were mixed evenly in 100 mL of isopropanol, heated under reflux for 5 h at 50°C, and the coupling agent was controlled to be gradually hydrolyzed, and the dissociated Si-OH was dehydrated and cross-linked with the Si-OH groups on the surface of the microbeads; washed with 500 mL of anhydrous ethanol for 3 times, filtered, and vacuum dried to obtain surface-modified hollow silica microbeads;

[0017] Step S12: 30 g of perfluoroalkoxysilane and 30 g of methoxysilane were mixed evenly, the pH was adjusted to 3, 100 g of aqueous polyurethane emulsion was added, the mixture was heated to 60° C., and refluxed for 5 h to obtain a hybrid resin pre-crosslinked to a certain molecular weight and mainly containing a Si-O-Si main chain structure;

[0018] Step S13: 100 parts of the hybrid resin and 1-5 parts of the surface-modified hollow silica microspheres are mixed and stirred for 0.5 h to obtain a high temperature resistant, heat insulating and chemical resistant top coating.

[0019] The present invention has the following beneficial effects:

[0020] (1) Chemically modify the graphene surface using a reactive dispersant, and apply the stable graphene dispersion to the high-temperature resistant anti-corrosion primer to improve the anti-corrosion performance of the coating;

[0021] (2) Use perfluoroalkoxysilane to modify the surface of hollow silica microspheres to increase the adhesion with the resin and effectively improve the overall cross-linking density of the coating, thereby achieving the purpose of heat resistance and heat insulation;

[0022] (3) The organic-inorganic hybrid fluorine-silicone resin has a large amount of Si-O-Si network main chain structure, has very good adhesion to the filler, can be further cross-linked to form a dense coating, and has excellent high temperature resistance;

[0023] (4) The introduction of a small amount of perfluorinated side chains, after surface migration and rearrangement, has very excellent chemical resistance and provides a certain degree of flexibility for the coating;

[0024] (5) The physical properties of the coatings were improved by spraying a mixed solution of N,N-dimethylformamide and propylene glycol in a mass ratio of 1:1 on the heat-resistant and anti-corrosion primer, and then quickly spraying a mixed solution of 100 parts of hybrid resin and 5 parts of surface-modified hollow silica microspheres in proportion. DETAILED DESCRIPTION

[0025] The present invention is further described below with reference to the following embodiments.

[0026] Example 1

[0027] (1) Preparation method of heat-resistant and anti-corrosion primer

[0028] Step S1: 30 ml of xylene, 20 ml of N,N-dimethylformamide and 10 ml of N-methylpyrrolidone are added to obtain a mixed solution;

[0029] Step S2: Then add graphene oxide powder at 0.5 g / ml and shear at high speed for 0.5 h;

[0030] Step S3: Add 10 ml of the obtained modified graphene oxide dispersion to 10 m of aqueous polyurethane emulsion to prepare a modified graphene oxide aqueous polyurethane anti-corrosion coating.

[0031] (2) Preparation of high temperature resistant, heat insulating and chemical resistant topcoat:

[0032] Step S11: 30 g of perfluoroalkoxysilane and 10 g of hollow silica microbead powder were mixed evenly in 100 mL of isopropanol, heated under reflux for 5 h at 50°C, and the coupling agent was controlled to be gradually hydrolyzed, and the dissociated Si-OH was dehydrated and cross-linked with the Si-OH groups on the surface of the microbeads; washed with 500 mL of anhydrous ethanol for 3 times, filtered, and vacuum dried to obtain surface-modified hollow silica microbeads;

[0033] Step S12: 30 g of perfluoroalkoxysilane and 30 g of methoxysilane were mixed evenly, the pH was adjusted to 3, 100 g of aqueous polyurethane emulsion was added, the mixture was heated to 60° C., and refluxed for 5 h to obtain a hybrid resin pre-crosslinked to a certain molecular weight and mainly containing a Si-O-Si main chain structure;

[0034] Step S13: 100 parts of hybrid resin and 1 part of surface-modified hollow silica microspheres are mixed and stirred for 0.5 hours according to the mass fraction, and then applied on the heat-resistant and anti-corrosion primer; and programmed temperature is used for baking, and the final temperature reaches 180°C-200°C and is maintained for 1 hour.

[0035] The baking process in step S13 allows the low molecular alcohols and pH regulators generated by the reaction in the system to be fully released, and the Si-OH is fully cross-linked; during the baking process, the perfluoroalkyl chain segments have good surface mobility due to their low surface free energy and are located on the side chains of the macromolecules, and the coating film that has undergone migration and rearrangement has better chemical resistance.

[0036] Example 2

[0037] The same as Example 1, except that the mass fraction of the surface-modified hollow silica microbeads in step 3 is changed to 2 parts.

[0038] Example 3

[0039] The same as Example 1, except that the mass fraction of the surface-modified hollow silica microbeads in step 3 was changed to 3 parts.

[0040] Example 4

[0041] The same as Example 1, except that the mass fraction of the surface-modified hollow silica microbeads in step 3 was changed to 4 parts.

[0042] Example 5

[0043] The same as Example 1, except that the mass fraction of the surface-modified hollow silica microbeads in step 3 was changed to 5 parts.

[0044] Example 6

[0045] Step S13 in Example 5: 100 parts of the hybrid resin and 5 parts of the surface-modified hollow silica microspheres are mixed in proportion according to mass fraction;

[0046] A mixed solution of N,N-dimethylformamide and propylene glycol in a mass ratio of 1:1 is sprayed on the heat-resistant and anti-corrosion primer, and then a mixed solution of 100 parts of hybrid resin and 5 parts of surface-modified hollow silica microspheres is quickly sprayed. The baking temperature is maintained below the boiling point of DMF, that is, the baking temperature is lower than 153°C. The baking is carried out for 0.5h, and then the temperature is raised to 200°C and maintained for 1 hour.

[0047] Table 1 Performance test

[0048] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 High temperature resistance (℃) 700 800 920 960 1000 1000 Neutral salt spray resistance (h) 2000h, no abnormality 2400h, no abnormality 2800h, no abnormality 2900h, no abnormality 3000h, no abnormality 3000h no abnormality Artificial aging resistance (h) 1500h, no abnormality 1700h, no abnormality 1800h, no abnormality 1830h, no abnormality 2000h, no abnormality 2000h, no abnormality Impact resistance (cm) Positive and negative stroke 50 Positive and negative impact Positive 50, cracked Positive 50, cracked Positive 50, cracked The main offender is 50

[0049] As can be seen from Table 1, with the increase in the mass fraction of the surface-modified hollow silica microspheres in step 3, the high temperature resistance and neutral salt spray resistance are improved, but the increase in the mass fraction of the hollow silica microspheres also reduces the connection ability between the heat-resistant anti-blocking primer and the hybrid resin. By spraying a mixed solution of DMF and propylene glycol in a mass ratio of 1:1 on the heat-resistant anti-corrosion primer, and adding 5 parts of hollow silica microspheres, while maintaining the high temperature resistance, neutral salt spray resistance and artificial aging resistance, it can also maintain good impact resistance.

[0050] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A high temperature resistant, heat insulating and chemical resistant coating for an armed escort vehicle, comprising a heat resistant and anticorrosive primer and a high temperature resistant, heat insulating and chemical resistant topcoat, characterized in that: The preparation method of the heat-resistant anticorrosive primer comprises the following steps: Step S1: 30 ml of xylene, 20 ml of N,N-dimethylformamide and 10 ml of N-methylpyrrolidone are added to obtain a mixed solution; Step S2: Then add graphene oxide powder at 0.5 g / ml and shear at high speed for 0.5 h; Step S3: adding 10 ml of the obtained modified graphene oxide dispersion to 10 mL of aqueous polyurethane emulsion to prepare a modified graphene oxide aqueous polyurethane anti-corrosion coating; The preparation method of the high temperature resistant, heat insulating and chemical resistant topcoat is as follows: Step S11: 30 g of perfluoroalkoxysilane and 10 g of hollow silica microbead powder were mixed evenly in 100 mL of isopropanol, heated under reflux for 5 h at 50°C, and the coupling agent was controlled to be gradually hydrolyzed, and the dissociated Si-OH was dehydrated and cross-linked with the Si-OH groups on the surface of the microbeads; washed with 500 mL of anhydrous ethanol for 3 times, filtered, and vacuum dried to obtain surface-modified hollow silica microbeads; Step S12: 30 g of perfluoroalkoxysilane and 30 g of methoxysilane were mixed evenly, the pH was adjusted to 3, 100 g of aqueous polyurethane emulsion was added, the mixture was heated to 60° C., and refluxed for 5 h to obtain a hybrid resin pre-crosslinked to a certain molecular weight and mainly containing a Si-O-Si main chain structure; Step S13: 100 parts of the hybrid resin and 1 part of the surface-modified hollow silica microspheres are mixed and stirred for 0.5 h to obtain a high temperature resistant, heat insulating and chemical resistant topcoat.